Sites with rating of ICO can mislead you, because they can advertise special ICO. I check their marks at different sourses, read reviews about project.
It is obvious that those sites are not to be trusted, a centralized service can always be corrupted and since we are talking about a lot of money here a project could pay to get a better rating from any of those sites and if that is the case they could mislead the investors to think that the project in which they are investing is going to change the world of cryptocurrencies when that is not the case.